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Rifles, Reloading, Optics, Equipment
Reloading
Case head separation?
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<blockquote data-quote="LoneTraveler" data-source="post: 1274890" data-attributes="member: 77249"><p>Being a Rimmed case the Head space would be by the rim. From drawings of the 460 S&W the rim thickness is .059.</p><p> </p><p>The previous post on using a fired primer would give you a good idea if the head space is excessive. </p><p> </p><p>I have made shims from an aluminum beverage can to find excessive head space.</p><p> </p><p>The 7X61 Sharp and Hart cartridge in the Schultz & Larson Rifle with its back of bolt lugs was notorious for head separation of cases because of Action stretch.</p><p> </p><p>Some years ago a company imported a 357 Mag. Lever Action rifle from I believe it was Brazil that had a soft bolt or soft action. At that time we carried a 357 Mag. side arm. Several officers bought these 357 lever rifles for a work gun to carry and use the same ammo as the pistol carried. After about 50 rounds of duty ammo the headspace went out of specs. and they had trouble with cases loaded 2 or 3 times would separate in the rifle chamber. </p><p>I was ready to get one of these rifles when problems arose. Heck No. </p><p> </p><p>When the pressure builds in the chamber the case walls swells tight against the chamber if the head of the case then gives the brass will thin and separate. </p><p> </p><p>If the head space is to much could cause this problem. Or the action is stretching to allow the case to separate. </p><p> </p><p>If you do the math. 460 S&W case head diameter .520 and published pressure at 65000 PSI. may cause enough stress on the action to stretch it on firing.</p><p> </p><p>Good Luck in finding the problem and a solution.</p></blockquote><p></p>
[QUOTE="LoneTraveler, post: 1274890, member: 77249"] Being a Rimmed case the Head space would be by the rim. From drawings of the 460 S&W the rim thickness is .059. The previous post on using a fired primer would give you a good idea if the head space is excessive. I have made shims from an aluminum beverage can to find excessive head space. The 7X61 Sharp and Hart cartridge in the Schultz & Larson Rifle with its back of bolt lugs was notorious for head separation of cases because of Action stretch. Some years ago a company imported a 357 Mag. Lever Action rifle from I believe it was Brazil that had a soft bolt or soft action. At that time we carried a 357 Mag. side arm. Several officers bought these 357 lever rifles for a work gun to carry and use the same ammo as the pistol carried. After about 50 rounds of duty ammo the headspace went out of specs. and they had trouble with cases loaded 2 or 3 times would separate in the rifle chamber. I was ready to get one of these rifles when problems arose. Heck No. When the pressure builds in the chamber the case walls swells tight against the chamber if the head of the case then gives the brass will thin and separate. If the head space is to much could cause this problem. Or the action is stretching to allow the case to separate. If you do the math. 460 S&W case head diameter .520 and published pressure at 65000 PSI. may cause enough stress on the action to stretch it on firing. Good Luck in finding the problem and a solution. [/QUOTE]
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Case head separation?
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